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SCSI Bus Bridge Card
Located centrally in the front of a 2104 Model DU3 or 2104 Model TU3, the SCSI bus
bridge card controls the SCSI bus configuration of the 2104. It assigns the disk drive
modules to a SCSI bus, in accordance with the setting of the SCSI bus split switch on
the switch card.
SCSI Bus Configurations
There are three valid configurations :
v Single bus, one initiator (SCSI ID 7), 14 disk drive modules (SCSI IDs 0 through 6,
and 8 through 14)
v Single bus, two initiators (SCSI IDs 5 and 6), 12 disk drive modules (SCSI IDs 0
through 4, and 8 through 14)
Note: In this configuration, slots 6 and 7 (SCSI ID 5 and 6) contain dummy disk
v Dual bus, two initiators (SCSI IDs 7 (x2)), 2 groups of 7 disk drive modules (SCSI
IDs 0 through 6, and 8 through 14)
Terminator
Figure 4. Single Bus, One Initiator, 14 Disk Drive Modules
10
2104 Models DU3 and TU3 Hardware Technical Information
drive modules. SCSI ID 7 is reserved.
0 1 2 3 4 5 6
14 disk drive modules
Terminator
8 9 10 11 12 13 14
Terminators
SCSI bus
bridge card
Repeater
Host bus adapter (HBA)
ID:7
Repeater
SCSI
interface
Enclosure
card
service
processor
Terminator
Backplane
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